NP Letters on Caduceus Nurse Practitioner Pin Description A Caduceus emblem pin approximately 1″ high with the letters NP in navy blue. A professional quality pin for the Nurse Practitioner. A lasting symbol of your hard work. Beautiful hand crafted cloisonne jewelry. Each pin is individually handmade using old world craftsmanship. Painstaking attention to detail and fine gold plating enhance each pin and provide a distinguished appearance.